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Preheat oven to 350F. In a small saucepan, melt the butter over medium heat. Once the butter is melted, whisk in the flour.
Slowly whisk in the milk. Once the milk is warm, stir in 1/2 cup of cheddar, 1/2 cup gouda, and the Parmesan. Then stir in the garlic powder, dried mustard, salt, and pepper.
Layer half the potatoes in a greased 2-quart baking dish. Pour half the cheese sauce over the potatoes. Then layer the other half of the potatoes and top with the remaining cheese sauce Sprinkle with the rest of the shredded gouda and cheddar cheese.
Bake for 1 hour.
Once done, remove and allow to rest for 10-15 minutes before serving.